Ukraine’s latest crisis began last November after Prime Minister Viktor Yanukovych refused to sign an economic cooperation/integration pact with the European Union. Instead, near bankrupt Kiev accepted a Russian offer to supply heavily discounted natural gas and a pledge to buy billions worth of its shaky bonds.

Demonstrations erupted in Kiev and, later, Lvov. The Russian-backed Yanukovich government reacted with brutal police repression. Violence has mounted in recent days, with at least two demonstrators killed and scores injured on both sides. Moscow is making warnings.